A correction: ec.lock() does not lock the object store. The object store only gets locked when operations that may change EO state are performed - fetching and saving being the most common.
Chuck From: Webobjects-dev <webobjects-dev-bounces+chill=gevityinc....@lists.apple.com> on behalf of René Bock <b...@salient-doremus.de> Date: Friday, October 13, 2017 at 1:14 AM To: Paul Hoadley <pa...@logicsquad.net> Cc: WebObjects-Dev <webobjects-dev@lists.apple.com> Subject: Re: Object registered within another EditingContext Hi, just creating a new EOEditingContext for the background task may lead to nasty deadlocks, as this EC refers to the default object store. As an ec.lock() locks its object store, so locking the ec in the background task has a side effect to the ECs in the main (worker) thread. You may consider to use ERXTask, which relies on a separate object store coordinator. (there is nice screencast about this topic in the WOCommunity space) The downside will be, that you have more open database connections and an increased heap footprint. Am 13.10.2017 um 00:42 schrieb Paul Hoadley <pa...@logicsquad.net<mailto:pa...@logicsquad.net>>: Hi André, On 13 Oct 2017, at 04:53, André Rothe <andre.ro...@phosco.info<mailto:andre.ro...@phosco.info>> wrote: Then I have created a thread with a new EditingContext to insert a lot of detail records, which have a reference to the first inserted record. You need to take some additional care when working in a background thread. 1. Don’t pass an existing EOEditingContext into a background thread, create a new one—you’re doing this. 2. Don’t pass existing EOs into a background thread, pass in the object’s EOGlobalID, and then get the object in the thread using that ID. * ERXEOControlUtilities.convertEOtoGID() * ERXEOControlUtilities.convertGIDtoEO() 3. There are some classes in er.extensions.concurrency that you might find helpful, though I’ve never used them. If you just want to use regular Java concurrency features, remember to handle EC locking/unlocking yourself: ec.lock(); try { // ... } finally { ec.unlock(); } (On the main thread, Wonder handles locking/unlocking for you.) -- Paul Hoadley https://logicsquad.net/ https://www.linkedin.com/company/logic-squad/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com<mailto:Webobjects-dev@lists.apple.com>) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/bock%40salient-doremus.de This email sent to b...@salient-doremus.de Mit freundlichen Grüßen René Bock -- Telefon: +49 69 650096 18 salient GmbH, Lindleystraße 12, 60314 Frankfurt Telefon Zentrale: 069 / 65 00 96 - 0 | www.salient-doremus.de<http://www.salient-doremus.de>
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